Among the electrolytes given below K2SO4,BaCl2,Al2(SO4)3 and NH4Cl which will be the most effective coagulating agent for Sb2S3 sol?
A
K2SO4
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B
BaCl2
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C
NH4Cl
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D
Al2(SO4)3
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Solution
The correct option is DAl2(SO4)3 The coagulating power of an electrolyte is directly proportional to the fourth power of valency of the active ions. Hence the most effective coagulating agent for Sb2S3 sol will be cation with maximum +ve charge as Sb2S3 is negatively charged sol.